While there are a large number of resources available for R, the following form a core start point:
R for Data Science is available online and can also be purchased from various sellers. It is a solid introduction to using the tidyverse set of packages and working with R in general.
compression.xlsx Data on the effects of various compression techniques, collected by Shelby Williamson for her senior thesis project at Hanover College, under the supervision of Molly Winke.
targeting.sav Data from the “Tuttle Shooting Decisions Study”, provided by Kati Tuttle.